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диоптрийное | кольцо
 кольцо
gen. ring; orb; wreath; zone; pacifier; wreaths
nautic. gromet; gromit; grommit

to phrases
диоптрийное: 18 phrases in 9 subjects
Artillery1
Cinematography2
Medical1
Military5
Occupational health & safety1
Optics branch of physics2
Photography1
Technology4
Weapons and gunsmithing1